The table shows the speed of sound in various materials at 20 °C and 1 atmosphere. Material Speed (m-s) Air (0 °C) 221

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peed of sound
The table shows the speed of sound in various materials at 20 °C
uced when this
and 1 atmosphere.
Material
Speed (m-s-)
Air (0 °C)
331
Air (20 °C)
343
Hydrogen
1 300
Water
1440
Sea water
1 560
rakes 5 s to
Iron and, steel
Take the speed
= 5 000
Glass
4 500
Aluminium
- 5 100
» Activity 1 Test yourself
Cognitive levels 1-4
Applying the properties of longitudinal waves
1 Calculate the frequency of a longitudinal sound wave of wavelength 0,5 m
that travels through steel at a speed of 5 060 m-s-1.
dol
2 A cello string vibrates with a frequency of 64 Hz. If the wavelength of the
waves in the string is 180 cm, calculate the wave speed.
3 Explain why it is impossible for sound to travel through a vacuum.
4 Calculate the wavelength of the sound waves that are produced by a tuning
fork marked C - 264 Hz. Take the speed of sound in air as 343 m-s-.
5 A boy stands between two tall buildings. When he claps his hands, he hears
the echo from one building after 2 s and the next echo from the other
1 hou
ation of
Dagation o
rarefied
e sound
building after 3 s. Calculate the distance between the buildings. Take the
speed of sound in air as 343 m-s'.
6 The audible range is between 20 Hz and 20 kHz.
a) If the velocity of sound in air is 343 m-s-, calculate the wavelength of the
highest and lowest notes.
b) Determine how many of each wavelength that you calculated in a)
would fit into a room 4 m long.
energy
anical
um.
a liquid
aster
ves of
are
acrease
C0 °C
UNIT 3- TERM ONE
117
Transcribed Image Text:peed of sound The table shows the speed of sound in various materials at 20 °C uced when this and 1 atmosphere. Material Speed (m-s-) Air (0 °C) 331 Air (20 °C) 343 Hydrogen 1 300 Water 1440 Sea water 1 560 rakes 5 s to Iron and, steel Take the speed = 5 000 Glass 4 500 Aluminium - 5 100 » Activity 1 Test yourself Cognitive levels 1-4 Applying the properties of longitudinal waves 1 Calculate the frequency of a longitudinal sound wave of wavelength 0,5 m that travels through steel at a speed of 5 060 m-s-1. dol 2 A cello string vibrates with a frequency of 64 Hz. If the wavelength of the waves in the string is 180 cm, calculate the wave speed. 3 Explain why it is impossible for sound to travel through a vacuum. 4 Calculate the wavelength of the sound waves that are produced by a tuning fork marked C - 264 Hz. Take the speed of sound in air as 343 m-s-. 5 A boy stands between two tall buildings. When he claps his hands, he hears the echo from one building after 2 s and the next echo from the other 1 hou ation of Dagation o rarefied e sound building after 3 s. Calculate the distance between the buildings. Take the speed of sound in air as 343 m-s'. 6 The audible range is between 20 Hz and 20 kHz. a) If the velocity of sound in air is 343 m-s-, calculate the wavelength of the highest and lowest notes. b) Determine how many of each wavelength that you calculated in a) would fit into a room 4 m long. energy anical um. a liquid aster ves of are acrease C0 °C UNIT 3- TERM ONE 117
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